3a6d1fcf9c
Log:
- merge in latest xenbus from dfr's xenhvm
- fix race condition in xs_read_reply by converting tsleep to mtx_sleep
Log:
unmask evtchn in bind_{virq, ipi}_to_irq
Log:
- remove code for handling case of not being able to sleep
- eliminate tsleep - make sleeps atomic
435 lines
8.2 KiB
C
435 lines
8.2 KiB
C
#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <sys/consio.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/tty.h>
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#include <sys/systm.h>
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#include <sys/taskqueue.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <machine/stdarg.h>
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#include <machine/xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/xen_intr.h>
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#include <sys/cons.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <dev/xen/console/xencons_ring.h>
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#include <xen/interface/io/console.h>
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#include "opt_ddb.h"
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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static char driver_name[] = "xc";
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devclass_t xc_devclass; /* do not make static */
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static void xcoutwakeup(struct tty *);
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static void xc_timeout(void *);
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static void __xencons_tx_flush(void);
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static boolean_t xcons_putc(int c);
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/* switch console so that shutdown can occur gracefully */
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static void xc_shutdown(void *arg, int howto);
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static int xc_mute;
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static void xcons_force_flush(void);
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static void xencons_priv_interrupt(void *);
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static cn_probe_t xccnprobe;
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static cn_init_t xccninit;
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static cn_getc_t xccngetc;
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static cn_putc_t xccnputc;
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static cn_putc_t xccnputc_dom0;
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static cn_checkc_t xccncheckc;
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#define XC_POLLTIME (hz/10)
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CONS_DRIVER(xc, xccnprobe, xccninit, NULL, xccngetc,
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xccncheckc, xccnputc, NULL);
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static int xen_console_up;
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static boolean_t xc_start_needed;
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static struct callout xc_callout;
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struct mtx cn_mtx;
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#define RBUF_SIZE 1024
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#define RBUF_MASK(_i) ((_i)&(RBUF_SIZE-1))
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#define WBUF_SIZE 4096
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#define WBUF_MASK(_i) ((_i)&(WBUF_SIZE-1))
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static char wbuf[WBUF_SIZE];
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static char rbuf[RBUF_SIZE];
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static int rc, rp;
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static unsigned int cnsl_evt_reg;
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static unsigned int wc, wp; /* write_cons, write_prod */
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#define CDEV_MAJOR 12
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#define XCUNIT(x) (dev2unit(x))
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#define ISTTYOPEN(tp) ((tp) && ((tp)->t_state & TS_ISOPEN))
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#define CN_LOCK_INIT(x, _name) \
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mtx_init(&x, _name, NULL, MTX_DEF|MTX_RECURSE)
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#define CN_LOCK(l) \
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do { \
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if (panicstr == NULL) \
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mtx_lock(&(l)); \
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} while (0)
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#define CN_UNLOCK(l) \
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do { \
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if (panicstr == NULL) \
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mtx_unlock(&(l)); \
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} while (0)
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#define CN_LOCK_ASSERT(x) mtx_assert(&x, MA_OWNED)
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#define CN_LOCK_DESTROY(x) mtx_destroy(&x)
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static struct tty *xccons;
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static tsw_open_t xcopen;
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static tsw_close_t xcclose;
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static struct ttydevsw xc_ttydevsw = {
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.tsw_flags = TF_NOPREFIX,
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.tsw_open = xcopen,
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.tsw_close = xcclose,
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.tsw_outwakeup = xcoutwakeup,
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};
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static void
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xccnprobe(struct consdev *cp)
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{
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cp->cn_pri = CN_REMOTE;
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sprintf(cp->cn_name, "%s0", driver_name);
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}
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static void
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xccninit(struct consdev *cp)
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{
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CN_LOCK_INIT(cn_mtx,"XCONS LOCK");
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}
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int
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xccngetc(struct consdev *dev)
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{
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int c;
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if (xc_mute)
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return 0;
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do {
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if ((c = xccncheckc(dev)) == -1) {
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/* polling without sleeping in Xen doesn't work well.
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* Sleeping gives other things like clock a chance to
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* run
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*/
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tsleep(&cn_mtx, PWAIT | PCATCH, "console sleep",
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XC_POLLTIME);
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}
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} while(c == -1);
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return c;
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}
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int
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xccncheckc(struct consdev *dev)
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{
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int ret = (xc_mute ? 0 : -1);
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if (xencons_has_input())
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xencons_handle_input(NULL);
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CN_LOCK(cn_mtx);
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if ((rp - rc)) {
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/* we need to return only one char */
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ret = (int)rbuf[RBUF_MASK(rc)];
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rc++;
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}
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CN_UNLOCK(cn_mtx);
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return(ret);
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}
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static void
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xccnputc(struct consdev *dev, int c)
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{
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xcons_putc(c);
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}
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static void
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xccnputc_dom0(struct consdev *dev, int c)
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{
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HYPERVISOR_console_io(CONSOLEIO_write, 1, (char *)&c);
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}
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extern int db_active;
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static boolean_t
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xcons_putc(int c)
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{
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int force_flush = xc_mute ||
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#ifdef DDB
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db_active ||
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#endif
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panicstr; /* we're not gonna recover, so force
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* flush
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*/
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if ((wp-wc) < (WBUF_SIZE-1)) {
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if ((wbuf[WBUF_MASK(wp++)] = c) == '\n') {
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wbuf[WBUF_MASK(wp++)] = '\r';
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#ifdef notyet
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if (force_flush)
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xcons_force_flush();
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#endif
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}
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} else if (force_flush) {
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#ifdef notyet
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xcons_force_flush();
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#endif
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}
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if (cnsl_evt_reg)
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__xencons_tx_flush();
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/* inform start path that we're pretty full */
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return ((wp - wc) >= WBUF_SIZE - 100) ? TRUE : FALSE;
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}
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static void
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xc_identify(driver_t *driver, device_t parent)
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{
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device_t child;
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child = BUS_ADD_CHILD(parent, 0, driver_name, 0);
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device_set_driver(child, driver);
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device_set_desc(child, "Xen Console");
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}
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static int
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xc_probe(device_t dev)
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{
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return (0);
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}
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static int
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xc_attach(device_t dev)
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{
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int error;
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struct xc_softc *sc = (struct xc_softc *)device_get_softc(dev);
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if (xen_start_info->flags & SIF_INITDOMAIN) {
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xc_consdev.cn_putc = xccnputc_dom0;
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}
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xccons = tty_alloc(&xc_ttydevsw, NULL, NULL);
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tty_makedev(xccons, NULL, "xc%r", 0);
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callout_init(&xc_callout, 0);
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xencons_ring_init();
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cnsl_evt_reg = 1;
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callout_reset(&xc_callout, XC_POLLTIME, xc_timeout, xccons);
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if (xen_start_info->flags & SIF_INITDOMAIN) {
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error = bind_virq_to_irqhandler(
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VIRQ_CONSOLE,
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0,
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"console",
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NULL,
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xencons_priv_interrupt,
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sc, INTR_TYPE_TTY, NULL);
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KASSERT(error >= 0, ("can't register console interrupt"));
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}
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/* register handler to flush console on shutdown */
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if ((EVENTHANDLER_REGISTER(shutdown_post_sync, xc_shutdown,
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NULL, SHUTDOWN_PRI_DEFAULT)) == NULL)
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printf("xencons: shutdown event registration failed!\n");
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return (0);
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}
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/*
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* return 0 for all console input, force flush all output.
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*/
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static void
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xc_shutdown(void *arg, int howto)
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{
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xc_mute = 1;
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xcons_force_flush();
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}
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void
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xencons_rx(char *buf, unsigned len)
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{
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int i;
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struct tty *tp = xccons;
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if (xen_console_up) {
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tty_lock(tp);
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for (i = 0; i < len; i++)
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ttydisc_rint(tp, buf[i], 0);
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ttydisc_rint_done(tp);
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tty_unlock(tp);
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} else {
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for (i = 0; i < len; i++)
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rbuf[RBUF_MASK(rp++)] = buf[i];
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}
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}
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static void
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__xencons_tx_flush(void)
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{
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int sz;
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CN_LOCK(cn_mtx);
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while (wc != wp) {
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int sent;
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sz = wp - wc;
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if (sz > (WBUF_SIZE - WBUF_MASK(wc)))
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sz = WBUF_SIZE - WBUF_MASK(wc);
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if (xen_start_info->flags & SIF_INITDOMAIN) {
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HYPERVISOR_console_io(CONSOLEIO_write, sz, &wbuf[WBUF_MASK(wc)]);
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wc += sz;
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} else {
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sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
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if (sent == 0)
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break;
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wc += sent;
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}
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}
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CN_UNLOCK(cn_mtx);
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}
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void
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xencons_tx(void)
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{
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__xencons_tx_flush();
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}
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static void
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xencons_priv_interrupt(void *arg)
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{
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static char rbuf[16];
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int l;
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while ((l = HYPERVISOR_console_io(CONSOLEIO_read, 16, rbuf)) > 0)
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xencons_rx(rbuf, l);
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xencons_tx();
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}
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static int
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xcopen(struct tty *tp)
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{
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xen_console_up = 1;
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return (0);
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}
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static void
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xcclose(struct tty *tp)
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{
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xen_console_up = 0;
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}
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static inline int
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__xencons_put_char(int ch)
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{
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char _ch = (char)ch;
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if ((wp - wc) == WBUF_SIZE)
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return 0;
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wbuf[WBUF_MASK(wp++)] = _ch;
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return 1;
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}
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static void
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xcoutwakeup(struct tty *tp)
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{
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boolean_t cons_full = FALSE;
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char c;
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while (ttydisc_getc(tp, &c, 1) == 1 && !cons_full)
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cons_full = xcons_putc(c);
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if (cons_full) {
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/* let the timeout kick us in a bit */
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xc_start_needed = TRUE;
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}
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}
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static void
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xc_timeout(void *v)
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{
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struct tty *tp;
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int c;
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tp = (struct tty *)v;
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tty_lock(tp);
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while ((c = xccncheckc(NULL)) != -1)
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ttydisc_rint(tp, c, 0);
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if (xc_start_needed) {
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xc_start_needed = FALSE;
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xcoutwakeup(tp);
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}
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tty_unlock(tp);
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callout_reset(&xc_callout, XC_POLLTIME, xc_timeout, tp);
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}
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static device_method_t xc_methods[] = {
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DEVMETHOD(device_identify, xc_identify),
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DEVMETHOD(device_probe, xc_probe),
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DEVMETHOD(device_attach, xc_attach),
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{0, 0}
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};
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static driver_t xc_driver = {
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driver_name,
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xc_methods,
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0,
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};
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/*** Forcibly flush console data before dying. ***/
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void
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xcons_force_flush(void)
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{
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int sz;
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if (xen_start_info->flags & SIF_INITDOMAIN)
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return;
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/* Spin until console data is flushed through to the domain controller. */
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while (wc != wp) {
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int sent = 0;
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if ((sz = wp - wc) == 0)
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continue;
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sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
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if (sent > 0)
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wc += sent;
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}
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}
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DRIVER_MODULE(xc, nexus, xc_driver, xc_devclass, 0, 0);
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 8
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* tab-width: 4
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* indent-tabs-mode: t
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* End:
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*/
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